class Solution
{
public:
    int jumpFloorII(int target)
    {
        vector<int> dp(target + 1);
        dp[0] = 1;
        dp[1] = 1;
        for (int i = 2; i <= target; ++i)
        {
            for (int j = 1; j <= i; ++j)
            {
                dp[i] += dp[i - j];
            }
        }
        return dp[target];
    }
};